You don't have to be that old to remember when calculators were cool — and now you can celebrate that bygone era with an HP Limited Edition Calculator ($80). While its landscape layout is slightly less revolutionary than it was 30 years ago when it launched, the 12c — its official name — is still a handsomely retro tool featuring a 10 character display, a RPN entry-system logic, over 120 built-in functions, 20 memory registers, a unique production number laser-etched on the back, a special, limited-edition gift box, and, for the financial gurus in the crowd, is good for use in CFP and CFA certification exams. [via]